[ENGEN-453] chore(amzn) add amazon linux 1 deprecate notice (#3966)

* chore(amzn) add amazon linux 1 deprecate notice

* fix(amzn1) rm redundant dep notice lines

per PR feedback

Co-authored-by: lena-larionova <54370747+lena-larionova@users.noreply.github.com>

Co-authored-by: lena-larionova <54370747+lena-larionova@users.noreply.github.com>

src/gateway/install-and-run/amazon-linux.md

@@ -2,6 +2,13 @@
 title: Install Kong Gateway on Amazon Linux
 ---
 
+{:.important}
+> **Deprecation notice**: Support for running Kong Gateway on
+Amazon Linux 1 is now deprecated, as [The Amazon Linux (1) AMI has ended standard support as of December 31, 2020](https://aws.amazon.com/blogs/aws/update-on-amazon-linux-ami-end-of-life).
+Starting with Kong Gateway 3.0.0.0, Kong is neither building new Amazon Linux 1 images nor packages. Nor will Kong test package installation on Amazon Linux 1.
+> If you need to install Kong Gateway on Amazon Linux 1, see the documentation for
+[previous versions](/gateway/2.8.x/install-and-run/amazon-linux/).
+
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